<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        h1 {
            /*倾斜效果*/
            font-style: italic;
        }

        em {
            /*正常效果*/
            font-style: normal;
        }
    </style>
</head>
<body>
<h1>一级标题</h1>
<em>em</em>
</body>
</html>